* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
body{
	background-color: #000000;
}
#app{
	width: 500px;
	height: 350px;
	margin: 100px auto 0;
	background-repeat: no-repeat;
	background-size: 100% 100%;
	position: relative;
	user-select: none;
}
#app .score{
	font-size: 22px;
	color: coral;
}
#app .time{
	font-size: 22px;
	color: red;
	position: absolute;
	right: 0;
	top: 0;
}
#app .keng{
	width: 50px;
	height: 50px;
	position: absolute;
	left: 0;
	top: 0;
}
#app .keng img{
	width: 100%;
	height: 100%;
}
#app button{
	border: 1px soli #fff;
	padding: 5px 18px;
	margin: 5px;
	color: #00aaff;
	border-radius: 5px;
	outline: none;
}
#app button.beginBtn{
	position: absolute;
	left: 130px;
	bottom: 75px;
}
#app button.aboutBtn{
	position: absolute;
	left: 250px;
	bottom: 75px;
}
#app .panel{
	width: 50%;
	height: 300px;
	margin: 0 auto;
	background-color: #fff;
	position: relative;
	left: 0px;
	right: 0px;
	top: 25px;
	
}
#app .panel h3{
	text-align: center;
	padding: 15px;
	color: coral;
}
#app .panel p{
	text-indent: 2em;
	font-size: 13px;
	line-height: 1.5;
	padding: 15px;
}
#app .game-over-panel p{
	text-indent: unset;
	text-align: center;
}
#app .game-over-panel p:first-of-type{
	margin-top: 80px;
}